1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
31 #include "gdkinternals.h"
34 #ifndef HAVE_XCONVERTCASE
35 #include "gdkkeysyms.h"
44 * @Short_description: Library initialization and miscellaneous functions
47 * This section describes the GDK initialization functions and miscellaneous
52 typedef struct _GdkPredicate GdkPredicate;
60 typedef struct _GdkThreadsDispatch GdkThreadsDispatch;
62 struct _GdkThreadsDispatch
66 GDestroyNotify destroy;
70 /* Private variable declarations
72 static int gdk_initialized = 0; /* 1 if the library is initialized,
76 static gchar *gdk_progclass = NULL;
78 static GMutex *gdk_threads_mutex = NULL; /* Global GDK lock */
80 static GCallback gdk_threads_lock = NULL;
81 static GCallback gdk_threads_unlock = NULL;
84 static const GDebugKey gdk_debug_keys[] = {
85 {"events", GDK_DEBUG_EVENTS},
86 {"misc", GDK_DEBUG_MISC},
87 {"dnd", GDK_DEBUG_DND},
88 {"xim", GDK_DEBUG_XIM},
89 {"nograbs", GDK_DEBUG_NOGRABS},
90 {"colormap", GDK_DEBUG_COLORMAP},
91 {"input", GDK_DEBUG_INPUT},
92 {"cursor", GDK_DEBUG_CURSOR},
93 {"multihead", GDK_DEBUG_MULTIHEAD},
94 {"xinerama", GDK_DEBUG_XINERAMA},
95 {"draw", GDK_DEBUG_DRAW},
96 {"eventloop", GDK_DEBUG_EVENTLOOP}
99 static const int gdk_ndebug_keys = G_N_ELEMENTS (gdk_debug_keys);
101 #endif /* G_ENABLE_DEBUG */
103 #ifdef G_ENABLE_DEBUG
105 gdk_arg_debug_cb (const char *key, const char *value, gpointer user_data, GError **error)
107 guint debug_value = g_parse_debug_string (value,
108 (GDebugKey *) gdk_debug_keys,
111 if (debug_value == 0 && value != NULL && strcmp (value, "") != 0)
114 G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
115 _("Error parsing option --gdk-debug"));
119 _gdk_debug_flags |= debug_value;
125 gdk_arg_no_debug_cb (const char *key, const char *value, gpointer user_data, GError **error)
127 guint debug_value = g_parse_debug_string (value,
128 (GDebugKey *) gdk_debug_keys,
131 if (debug_value == 0 && value != NULL && strcmp (value, "") != 0)
134 G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
135 _("Error parsing option --gdk-no-debug"));
139 _gdk_debug_flags &= ~debug_value;
143 #endif /* G_ENABLE_DEBUG */
146 gdk_arg_class_cb (const char *key, const char *value, gpointer user_data, GError **error)
148 gdk_set_program_class (value);
154 gdk_arg_name_cb (const char *key, const char *value, gpointer user_data, GError **error)
156 g_set_prgname (value);
161 static const GOptionEntry gdk_args[] = {
162 { "class", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_class_cb,
163 /* Description of --class=CLASS in --help output */ N_("Program class as used by the window manager"),
164 /* Placeholder in --class=CLASS in --help output */ N_("CLASS") },
165 { "name", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_name_cb,
166 /* Description of --name=NAME in --help output */ N_("Program name as used by the window manager"),
167 /* Placeholder in --name=NAME in --help output */ N_("NAME") },
168 { "display", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_STRING, &_gdk_display_name,
169 /* Description of --display=DISPLAY in --help output */ N_("X display to use"),
170 /* Placeholder in --display=DISPLAY in --help output */ N_("DISPLAY") },
171 { "screen", 0, 0, G_OPTION_ARG_INT, &_gdk_screen_number,
172 /* Description of --screen=SCREEN in --help output */ N_("X screen to use"),
173 /* Placeholder in --screen=SCREEN in --help output */ N_("SCREEN") },
174 #ifdef G_ENABLE_DEBUG
175 { "gdk-debug", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_debug_cb,
176 /* Description of --gdk-debug=FLAGS in --help output */ N_("GDK debugging flags to set"),
177 /* Placeholder in --gdk-debug=FLAGS in --help output */ N_("FLAGS") },
178 { "gdk-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_no_debug_cb,
179 /* Description of --gdk-no-debug=FLAGS in --help output */ N_("GDK debugging flags to unset"),
180 /* Placeholder in --gdk-no-debug=FLAGS in --help output */ N_("FLAGS") },
186 * gdk_add_option_entries_libgtk_only:
187 * @group: An option group.
189 * Appends gdk option entries to the passed in option group. This is
190 * not public API and must not be used by applications.
193 gdk_add_option_entries_libgtk_only (GOptionGroup *group)
195 g_option_group_add_entries (group, gdk_args);
196 g_option_group_add_entries (group, _gdk_windowing_args);
200 gdk_pre_parse_libgtk_only (void)
202 gdk_initialized = TRUE;
204 /* We set the fallback program class here, rather than lazily in
205 * gdk_get_program_class, since we don't want -name to override it.
207 gdk_progclass = g_strdup (g_get_prgname ());
208 if (gdk_progclass && gdk_progclass[0])
209 gdk_progclass[0] = g_ascii_toupper (gdk_progclass[0]);
211 #ifdef G_ENABLE_DEBUG
213 gchar *debug_string = getenv("GDK_DEBUG");
214 if (debug_string != NULL)
215 _gdk_debug_flags = g_parse_debug_string (debug_string,
216 (GDebugKey *) gdk_debug_keys,
219 #endif /* G_ENABLE_DEBUG */
221 if (getenv ("GDK_NATIVE_WINDOWS"))
223 _gdk_native_windows = TRUE;
224 /* Ensure that this is not propagated
225 to spawned applications */
226 g_unsetenv ("GDK_NATIVE_WINDOWS");
231 /* Do any setup particular to the windowing system */
232 gdk_display_manager_get ();
238 * @argc: the number of command line arguments.
239 * @argv: the array of command line arguments.
241 * Parse command line arguments, and store for future
242 * use by calls to gdk_display_open().
244 * Any arguments used by GDK are removed from the array and @argc and @argv are
245 * updated accordingly.
247 * You shouldn't call this function explicitely if you are using
248 * gtk_init(), gtk_init_check(), gdk_init(), or gdk_init_check().
253 gdk_parse_args (int *argc,
256 GOptionContext *option_context;
257 GOptionGroup *option_group;
258 GError *error = NULL;
263 gdk_pre_parse_libgtk_only ();
265 option_context = g_option_context_new (NULL);
266 g_option_context_set_ignore_unknown_options (option_context, TRUE);
267 g_option_context_set_help_enabled (option_context, FALSE);
268 option_group = g_option_group_new (NULL, NULL, NULL, NULL, NULL);
269 g_option_context_set_main_group (option_context, option_group);
271 g_option_group_add_entries (option_group, gdk_args);
272 g_option_group_add_entries (option_group, _gdk_windowing_args);
274 if (!g_option_context_parse (option_context, argc, argv, &error))
276 g_warning ("%s", error->message);
277 g_error_free (error);
279 g_option_context_free (option_context);
281 GDK_NOTE (MISC, g_message ("progname: \"%s\"", g_get_prgname ()));
285 * gdk_get_display_arg_name:
287 * Gets the display name specified in the command line arguments passed
288 * to gdk_init() or gdk_parse_args(), if any.
290 * Returns: the display name, if specified explicitely, otherwise %NULL
291 * this string is owned by GTK+ and must not be modified or freed.
295 G_CONST_RETURN gchar *
296 gdk_get_display_arg_name (void)
298 if (!_gdk_display_arg_name)
300 if (_gdk_screen_number >= 0)
301 _gdk_display_arg_name = _gdk_windowing_substitute_screen_number (_gdk_display_name, _gdk_screen_number);
303 _gdk_display_arg_name = g_strdup (_gdk_display_name);
306 return _gdk_display_arg_name;
310 * gdk_display_open_default_libgtk_only:
312 * Opens the default display specified by command line arguments or
313 * environment variables, sets it as the default display, and returns
314 * it. gdk_parse_args must have been called first. If the default
315 * display has previously been set, simply returns that. An internal
316 * function that should not be used by applications.
318 * Return value: (transfer none): the default display, if it could be
319 * opened, otherwise %NULL.
322 gdk_display_open_default_libgtk_only (void)
326 g_return_val_if_fail (gdk_initialized, NULL);
328 display = gdk_display_get_default ();
332 display = gdk_display_open (gdk_get_display_arg_name ());
334 if (!display && _gdk_screen_number >= 0)
336 g_free (_gdk_display_arg_name);
337 _gdk_display_arg_name = g_strdup (_gdk_display_name);
339 display = gdk_display_open (_gdk_display_name);
347 * @argc: (inout): the number of command line arguments.
348 * @argv: (array length=argc) (inout): the array of command line arguments.
350 * Initializes the GDK library and connects to the X server, returning %TRUE on
353 * Any arguments used by GDK are removed from the array and @argc and @argv are
354 * updated accordingly.
356 * GTK+ initializes GDK in gtk_init() and so this function is not usually needed
357 * by GTK+ applications.
359 * Returns: %TRUE if initialization succeeded.
362 gdk_init_check (int *argc,
365 gdk_parse_args (argc, argv);
367 return gdk_display_open_default_libgtk_only () != NULL;
373 * @argc: (inout): the number of command line arguments.
374 * @argv: (array length=argc) (inout): the array of command line arguments.
376 * Initializes the GDK library and connects to the X server.
377 * If initialization fails, a warning message is output and the application
378 * terminates with a call to <literal>exit(1)</literal>.
380 * Any arguments used by GDK are removed from the array and @argc and @argv are
381 * updated accordingly.
383 * GTK+ initializes GDK in gtk_init() and so this function is not usually needed
384 * by GTK+ applications.
387 gdk_init (int *argc, char ***argv)
389 if (!gdk_init_check (argc, argv))
391 const char *display_name = gdk_get_display_arg_name ();
392 g_warning ("cannot open display: %s", display_name ? display_name : "");
401 * @Short_description: Functions for using GDK in multi-threaded programs
404 * For thread safety, GDK relies on the thread primitives in GLib,
405 * and on the thread-safe GLib main loop.
407 * GLib is completely thread safe (all global data is automatically
408 * locked), but individual data structure instances are not automatically
409 * locked for performance reasons. So e.g. you must coordinate
410 * accesses to the same #GHashTable from multiple threads.
412 * GTK+ is "thread aware" but not thread safe — it provides a
413 * global lock controlled by gdk_threads_enter()/gdk_threads_leave()
414 * which protects all use of GTK+. That is, only one thread can use GTK+
417 * Unfortunately the above holds with the X11 backend only. With the
418 * Win32 backend, GDK calls should not be attempted from multiple threads
421 * You must call g_thread_init() and gdk_threads_init() before executing
422 * any other GTK+ or GDK functions in a threaded GTK+ program.
424 * Idles, timeouts, and input functions from GLib, such as g_idle_add(), are
425 * executed outside of the main GTK+ lock.
426 * So, if you need to call GTK+ inside of such a callback, you must surround
427 * the callback with a gdk_threads_enter()/gdk_threads_leave() pair or use
428 * gdk_threads_add_idle_full() which does this for you.
429 * However, event dispatching from the mainloop is still executed within
430 * the main GTK+ lock, so callback functions connected to event signals
431 * like #GtkWidget::button-press-event, do not need thread protection.
433 * In particular, this means, if you are writing widgets that might
434 * be used in threaded programs, you <emphasis>must</emphasis> surround
435 * timeouts and idle functions in this matter.
437 * As always, you must also surround any calls to GTK+ not made within
438 * a signal handler with a gdk_threads_enter()/gdk_threads_leave() pair.
440 * Before calling gdk_threads_leave() from a thread other
441 * than your main thread, you probably want to call gdk_flush()
442 * to send all pending commands to the windowing system.
443 * (The reason you don't need to do this from the main thread
444 * is that GDK always automatically flushes pending commands
445 * when it runs out of incoming events to process and has
446 * to sleep while waiting for more events.)
448 * A minimal main program for a threaded GTK+ application
451 * <programlisting role="C">
453 * main (int argc, char *argv[])
457 * g_thread_init (NULL);
458 * gdk_threads_init (<!-- -->);
459 * gdk_threads_enter (<!-- -->);
461 * gtk_init (&argc, &argv);
463 * window = create_window (<!-- -->);
464 * gtk_widget_show (window);
466 * gtk_main (<!-- -->);
467 * gdk_threads_leave (<!-- -->);
474 * Callbacks require a bit of attention. Callbacks from GTK+ signals
475 * are made within the GTK+ lock. However callbacks from GLib (timeouts,
476 * IO callbacks, and idle functions) are made outside of the GTK+
477 * lock. So, within a signal handler you do not need to call
478 * gdk_threads_enter(), but within the other types of callbacks, you
481 * Erik Mouw contributed the following code example to
482 * illustrate how to use threads within GTK+ programs.
484 * <programlisting role="C">
485 * /<!---->*-------------------------------------------------------------------------
486 * * Filename: gtk-thread.c
488 * * Copyright: Copyright (C) 1999, Erik Mouw
489 * * Author: Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
490 * * Description: GTK threads example.
491 * * Created at: Sun Oct 17 21:27:09 1999
492 * * Modified by: Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
493 * * Modified at: Sun Oct 24 17:21:41 1999
494 * *-----------------------------------------------------------------------*<!---->/
498 * * cc -o gtk-thread gtk-thread.c `gtk-config --cflags --libs gthread`
500 * * Thanks to Sebastian Wilhelmi and Owen Taylor for pointing out some
506 * #include <stdlib.h>
507 * #include <unistd.h>
509 * #include <gtk/gtk.h>
511 * #include <pthread.h>
513 * #define YES_IT_IS (1)
514 * #define NO_IT_IS_NOT (0)
522 * G_LOCK_DEFINE_STATIC (yes_or_no);
523 * static volatile int yes_or_no = YES_IT_IS;
525 * void destroy (GtkWidget *widget, gpointer data)
527 * gtk_main_quit (<!-- -->);
530 * void *argument_thread (void *args)
532 * yes_or_no_args *data = (yes_or_no_args *)args;
533 * gboolean say_something;
537 * /<!---->* sleep a while *<!---->/
538 * sleep(rand(<!-- -->) / (RAND_MAX / 3) + 1);
540 * /<!---->* lock the yes_or_no_variable *<!---->/
543 * /<!---->* do we have to say something? *<!---->/
544 * say_something = (yes_or_no != data->what);
548 * /<!---->* set the variable *<!---->/
549 * yes_or_no = data->what;
552 * /<!---->* Unlock the yes_or_no variable *<!---->/
553 * G_UNLOCK (yes_or_no);
557 * /<!---->* get GTK thread lock *<!---->/
558 * gdk_threads_enter (<!-- -->);
560 * /<!---->* set label text *<!---->/
561 * if(data->what == YES_IT_IS)
562 * gtk_label_set_text (GTK_LABEL (data->label), "O yes, it is!");
564 * gtk_label_set_text (GTK_LABEL (data->label), "O no, it isn't!");
566 * /<!---->* release GTK thread lock *<!---->/
567 * gdk_threads_leave (<!-- -->);
574 * int main (int argc, char *argv[])
578 * yes_or_no_args yes_args, no_args;
579 * pthread_t no_tid, yes_tid;
581 * /<!---->* init threads *<!---->/
582 * g_thread_init (NULL);
583 * gdk_threads_init (<!-- -->);
584 * gdk_threads_enter (<!-- -->);
586 * /<!---->* init gtk *<!---->/
587 * gtk_init(&argc, &argv);
589 * /<!---->* init random number generator *<!---->/
590 * srand ((unsigned int) time (NULL));
592 * /<!---->* create a window *<!---->/
593 * window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
595 * g_signal_connect (window, "destroy", G_CALLBACK (destroy), NULL);
597 * gtk_container_set_border_width (GTK_CONTAINER (window), 10);
599 * /<!---->* create a label *<!---->/
600 * label = gtk_label_new ("And now for something completely different ...");
601 * gtk_container_add (GTK_CONTAINER (window), label);
603 * /<!---->* show everything *<!---->/
604 * gtk_widget_show (label);
605 * gtk_widget_show (window);
607 * /<!---->* create the threads *<!---->/
608 * yes_args.label = label;
609 * yes_args.what = YES_IT_IS;
610 * pthread_create (&yes_tid, NULL, argument_thread, &yes_args);
612 * no_args.label = label;
613 * no_args.what = NO_IT_IS_NOT;
614 * pthread_create (&no_tid, NULL, argument_thread, &no_args);
616 * /<!---->* enter the GTK main loop *<!---->/
617 * gtk_main (<!-- -->);
618 * gdk_threads_leave (<!-- -->);
630 * This macro marks the beginning of a critical section in which GDK and
631 * GTK+ functions can be called safely and without causing race
632 * conditions. Only one thread at a time can be in such a critial
636 gdk_threads_enter (void)
638 if (gdk_threads_lock)
639 (*gdk_threads_lock) ();
645 * Leaves a critical region begun with gdk_threads_enter().
648 gdk_threads_leave (void)
650 if (gdk_threads_unlock)
651 (*gdk_threads_unlock) ();
655 gdk_threads_impl_lock (void)
657 if (gdk_threads_mutex)
658 g_mutex_lock (gdk_threads_mutex);
662 gdk_threads_impl_unlock (void)
664 if (gdk_threads_mutex)
665 g_mutex_unlock (gdk_threads_mutex);
671 * Initializes GDK so that it can be used from multiple threads
672 * in conjunction with gdk_threads_enter() and gdk_threads_leave().
673 * g_thread_init() must be called previous to this function.
675 * This call must be made before any use of the main loop from
676 * GTK+; to be safe, call it before gtk_init().
679 gdk_threads_init (void)
681 if (!g_thread_supported ())
682 g_error ("g_thread_init() must be called before gdk_threads_init()");
684 gdk_threads_mutex = g_mutex_new ();
685 if (!gdk_threads_lock)
686 gdk_threads_lock = gdk_threads_impl_lock;
687 if (!gdk_threads_unlock)
688 gdk_threads_unlock = gdk_threads_impl_unlock;
692 * gdk_threads_set_lock_functions:
693 * @enter_fn: function called to guard GDK
694 * @leave_fn: function called to release the guard
696 * Allows the application to replace the standard method that
697 * GDK uses to protect its data structures. Normally, GDK
698 * creates a single #GMutex that is locked by gdk_threads_enter(),
699 * and released by gdk_threads_leave(); using this function an
700 * application provides, instead, a function @enter_fn that is
701 * called by gdk_threads_enter() and a function @leave_fn that is
702 * called by gdk_threads_leave().
704 * The functions must provide at least same locking functionality
705 * as the default implementation, but can also do extra application
706 * specific processing.
708 * As an example, consider an application that has its own recursive
709 * lock that when held, holds the GTK+ lock as well. When GTK+ unlocks
710 * the GTK+ lock when entering a recursive main loop, the application
711 * must temporarily release its lock as well.
713 * Most threaded GTK+ apps won't need to use this method.
715 * This method must be called before gdk_threads_init(), and cannot
716 * be called multiple times.
721 gdk_threads_set_lock_functions (GCallback enter_fn,
724 g_return_if_fail (gdk_threads_lock == NULL &&
725 gdk_threads_unlock == NULL);
727 gdk_threads_lock = enter_fn;
728 gdk_threads_unlock = leave_fn;
732 gdk_threads_dispatch (gpointer data)
734 GdkThreadsDispatch *dispatch = data;
735 gboolean ret = FALSE;
737 GDK_THREADS_ENTER ();
739 if (!g_source_is_destroyed (g_main_current_source ()))
740 ret = dispatch->func (dispatch->data);
742 GDK_THREADS_LEAVE ();
748 gdk_threads_dispatch_free (gpointer data)
750 GdkThreadsDispatch *dispatch = data;
752 if (dispatch->destroy && dispatch->data)
753 dispatch->destroy (dispatch->data);
755 g_slice_free (GdkThreadsDispatch, data);
760 * gdk_threads_add_idle_full:
761 * @priority: the priority of the idle source. Typically this will be in the
762 * range btweeen #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE
763 * @function: function to call
764 * @data: data to pass to @function
765 * @notify: (allow-none): function to call when the idle is removed, or %NULL
767 * Adds a function to be called whenever there are no higher priority
768 * events pending. If the function returns %FALSE it is automatically
769 * removed from the list of event sources and will not be called again.
771 * This variant of g_idle_add_full() calls @function with the GDK lock
772 * held. It can be thought of a MT-safe version for GTK+ widgets for the
773 * following use case, where you have to worry about idle_callback()
774 * running in thread A and accessing @self after it has been finalized
779 * idle_callback (gpointer data)
781 * /* gdk_threads_enter(); would be needed for g_idle_add() */
783 * SomeWidget *self = data;
784 * /* do stuff with self */
788 * /* gdk_threads_leave(); would be needed for g_idle_add() */
793 * some_widget_do_stuff_later (SomeWidget *self)
795 * self->idle_id = gdk_threads_add_idle (idle_callback, self)
796 * /* using g_idle_add() here would require thread protection in the callback */
800 * some_widget_finalize (GObject *object)
802 * SomeWidget *self = SOME_WIDGET (object);
804 * g_source_remove (self->idle_id);
805 * G_OBJECT_CLASS (parent_class)->finalize (object);
809 * Return value: the ID (greater than 0) of the event source.
814 gdk_threads_add_idle_full (gint priority,
815 GSourceFunc function,
817 GDestroyNotify notify)
819 GdkThreadsDispatch *dispatch;
821 g_return_val_if_fail (function != NULL, 0);
823 dispatch = g_slice_new (GdkThreadsDispatch);
824 dispatch->func = function;
825 dispatch->data = data;
826 dispatch->destroy = notify;
828 return g_idle_add_full (priority,
829 gdk_threads_dispatch,
831 gdk_threads_dispatch_free);
835 * gdk_threads_add_idle:
836 * @function: function to call
837 * @data: data to pass to @function
839 * A wrapper for the common usage of gdk_threads_add_idle_full()
840 * assigning the default priority, #G_PRIORITY_DEFAULT_IDLE.
842 * See gdk_threads_add_idle_full().
844 * Return value: the ID (greater than 0) of the event source.
849 gdk_threads_add_idle (GSourceFunc function,
852 return gdk_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
853 function, data, NULL);
858 * gdk_threads_add_timeout_full:
859 * @priority: the priority of the timeout source. Typically this will be in the
860 * range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
861 * @interval: the time between calls to the function, in milliseconds
862 * (1/1000ths of a second)
863 * @function: function to call
864 * @data: data to pass to @function
865 * @notify: (allow-none): function to call when the timeout is removed, or %NULL
867 * Sets a function to be called at regular intervals holding the GDK lock,
868 * with the given priority. The function is called repeatedly until it
869 * returns %FALSE, at which point the timeout is automatically destroyed
870 * and the function will not be called again. The @notify function is
871 * called when the timeout is destroyed. The first call to the
872 * function will be at the end of the first @interval.
874 * Note that timeout functions may be delayed, due to the processing of other
875 * event sources. Thus they should not be relied on for precise timing.
876 * After each call to the timeout function, the time of the next
877 * timeout is recalculated based on the current time and the given interval
878 * (it does not try to 'catch up' time lost in delays).
880 * This variant of g_timeout_add_full() can be thought of a MT-safe version
881 * for GTK+ widgets for the following use case:
884 * static gboolean timeout_callback (gpointer data)
886 * SomeWidget *self = data;
888 * /* do stuff with self */
890 * self->timeout_id = 0;
895 * static void some_widget_do_stuff_later (SomeWidget *self)
897 * self->timeout_id = g_timeout_add (timeout_callback, self)
900 * static void some_widget_finalize (GObject *object)
902 * SomeWidget *self = SOME_WIDGET (object);
904 * if (self->timeout_id)
905 * g_source_remove (self->timeout_id);
907 * G_OBJECT_CLASS (parent_class)->finalize (object);
911 * Return value: the ID (greater than 0) of the event source.
916 gdk_threads_add_timeout_full (gint priority,
918 GSourceFunc function,
920 GDestroyNotify notify)
922 GdkThreadsDispatch *dispatch;
924 g_return_val_if_fail (function != NULL, 0);
926 dispatch = g_slice_new (GdkThreadsDispatch);
927 dispatch->func = function;
928 dispatch->data = data;
929 dispatch->destroy = notify;
931 return g_timeout_add_full (priority,
933 gdk_threads_dispatch,
935 gdk_threads_dispatch_free);
939 * gdk_threads_add_timeout:
940 * @interval: the time between calls to the function, in milliseconds
941 * (1/1000ths of a second)
942 * @function: function to call
943 * @data: data to pass to @function
945 * A wrapper for the common usage of gdk_threads_add_timeout_full()
946 * assigning the default priority, #G_PRIORITY_DEFAULT.
948 * See gdk_threads_add_timeout_full().
950 * Return value: the ID (greater than 0) of the event source.
955 gdk_threads_add_timeout (guint interval,
956 GSourceFunc function,
959 return gdk_threads_add_timeout_full (G_PRIORITY_DEFAULT,
960 interval, function, data, NULL);
965 * gdk_threads_add_timeout_seconds_full:
966 * @priority: the priority of the timeout source. Typically this will be in the
967 * range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
968 * @interval: the time between calls to the function, in seconds
969 * @function: function to call
970 * @data: data to pass to @function
971 * @notify: (allow-none): function to call when the timeout is removed, or %NULL
973 * A variant of gdk_threads_add_timout_full() with second-granularity.
974 * See g_timeout_add_seconds_full() for a discussion of why it is
975 * a good idea to use this function if you don't need finer granularity.
977 * Return value: the ID (greater than 0) of the event source.
982 gdk_threads_add_timeout_seconds_full (gint priority,
984 GSourceFunc function,
986 GDestroyNotify notify)
988 GdkThreadsDispatch *dispatch;
990 g_return_val_if_fail (function != NULL, 0);
992 dispatch = g_slice_new (GdkThreadsDispatch);
993 dispatch->func = function;
994 dispatch->data = data;
995 dispatch->destroy = notify;
997 return g_timeout_add_seconds_full (priority,
999 gdk_threads_dispatch,
1001 gdk_threads_dispatch_free);
1005 * gdk_threads_add_timeout_seconds:
1006 * @interval: the time between calls to the function, in seconds
1007 * @function: function to call
1008 * @data: data to pass to @function
1010 * A wrapper for the common usage of gdk_threads_add_timeout_seconds_full()
1011 * assigning the default priority, #G_PRIORITY_DEFAULT.
1013 * For details, see gdk_threads_add_timeout_full().
1015 * Return value: the ID (greater than 0) of the event source.
1020 gdk_threads_add_timeout_seconds (guint interval,
1021 GSourceFunc function,
1024 return gdk_threads_add_timeout_seconds_full (G_PRIORITY_DEFAULT,
1025 interval, function, data, NULL);
1029 * gdk_get_program_class:
1031 * Gets the program class. Unless the program class has explicitly
1032 * been set with gdk_set_program_class() or with the <option>--class</option>
1033 * commandline option, the default value is the program name (determined
1034 * with g_get_prgname()) with the first character converted to uppercase.
1036 * Returns: the program class.
1038 G_CONST_RETURN char *
1039 gdk_get_program_class (void)
1041 return gdk_progclass;
1045 * gdk_set_program_class:
1046 * @program_class: a string.
1048 * Sets the program class. The X11 backend uses the program class to set
1049 * the class name part of the <literal>WM_CLASS</literal> property on
1050 * toplevel windows; see the ICCCM.
1053 gdk_set_program_class (const char *program_class)
1055 g_free (gdk_progclass);
1057 gdk_progclass = g_strdup (program_class);
1061 * gdk_disable_multidevice:
1063 * Disables multidevice support in GDK. This call must happen prior
1064 * to gdk_display_open(), gtk_init(), gtk_init_with_args() or
1065 * gtk_init_check() in order to take effect.
1067 * Most common GTK+ applications won't ever need to call this. Only
1068 * applications that do mixed GDK/Xlib calls could want to disable
1069 * multidevice support if such Xlib code deals with input devices in
1070 * any way and doesn't observe the presence of XInput 2.
1075 gdk_disable_multidevice (void)
1077 if (gdk_initialized)
1080 _gdk_disable_multidevice = TRUE;